Components (OmniFaces 3.13 API)

java.lang.Object
- org.omnifaces.util.Components

public final class Components
extends Object

Collection of utility methods for the JSF API with respect to working with UIComponent. There are several traversal/lookup methods, there are several UIForm and UIInput related methods which makes it easier to deal with forms and inputs.

Usage

Some examples:

 // Get closest parent of given type.
 UIForm form = Components.getClosestParent(someUIInputComponent, UIForm.class);

 // Get currently submitted form.
 UIForm form = Components.getCurrentForm();

 // Get currently invoked command, useful for logging actions in a phase listener.
 UICommand command = Components.getCurrentCommand();

 // Get the label of the given UIInput component as JSF uses for validation messages.
 String label = Components.getLabel(someUIInputComponent);

 // Inside decode() and/or encode() of some custom component, validate if it has no children.
 Components.validateHasNoChildren(this);

 // Programmatically include composite component.
 Components.includeCompositeComponent(someParentComponent, libraryName, tagName, id);

 // Programmatically create value and action expressions.
 UICommand command = new HtmlCommandButton();
 command.setId("foo");
 command.setValue(Components.createValueExpression("#{bundle['button.foo']}", String.class));
 command.addClientBehavior("action", Components.createAjaxBehavior("#{bean.ajaxListener}"));
 command.addActionListener(Components.createActionListenerMethodExpression("#{bean.actionListener}"));
 command.setActionExpression(Components.createVoidMethodExpression("#{bean.action}"));

 // Programmatically capture HTML output of a given view.
 String mailHtml = Components.encodeHtml(Components.buildView("/WEB-INF/mail-template.xhtml"));

 // Collecting all queued actions and action listeners as method expression strings in a logging phase listener.
 List<String> actions = Components.getActionExpressionsAndListeners(Components.getCurrentActionSource());

Author:: Bauke Scholtz, Arjan Tijms

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`Components.ForEach` Builder class used to collect a number of query parameters for a visit (for each) of components in the JSF component tree.

Field Summary

Fields
Modifier and Type Field and Description

static String LABEL_ATTRIBUTE
The name of the label attribute.

static String VALUE_ATTRIBUTE
The name of the value attribute.

Fields
Modifier and Type	Field and Description
`static String`	`LABEL_ATTRIBUTE` The name of the label attribute.
`static String`	`VALUE_ATTRIBUTE` The name of the value attribute.

Method Summary

All Methods Static Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static void`	`addFormIfNecessary()` Add an `UIForm` to the current view if absent.
`static void`	`addScript(String script)` Add given JavaScript code to the current view which is to be executed as an inline script when the rendering is completed.
`static void`	`addScriptResource(String libraryName, String resourceName)` Add given JavaScript resource to the current view.
`static UIComponent`	`addScriptResourceToBody(String libraryName, String resourceName)` Deprecated. since 3.6, use `addScriptResource(String, String)` instead as this will automatically detect already-added resources, non-@all ajax postbacks and rendering state and pick the most optimal approach to add the JavaScript resource.
`static UIComponent`	`addScriptResourceToHead(String libraryName, String resourceName)` Deprecated. since 3.6, use `addScriptResource(String, String)` instead as this will automatically detect already-added resources, non-@all ajax postbacks and rendering state and pick the most optimal approach to add the JavaScript resource.
`static UIComponent`	`addScriptToBody(String script)` Deprecated. since 3.6, use `addScript(String)` instead as this will automatically detect non-@all ajax postbacks.
`static UIViewRoot`	`buildView(String viewId)` Creates and builds a local view for the given view ID independently from the current view.
`static MethodExpressionActionListener`	`createActionListenerMethodExpression(String expression)` Create an action listener method expression based on the given EL expression.
`static AjaxBehavior`	`createAjaxBehavior(String expression)` Create an ajax behavior which should invoke an ajax listener method expression based on the given EL expression.
`static MethodExpression`	`createMethodExpression(String expression, Class<?> returnType, Class<?>... parameterTypes)` Create a method expression based on the given EL expression, the given return type and the given parameter types, if any.
`static ValueExpression`	`createValueExpression(String expression, Class<?> type)` Create an editable value expression based on the given EL expression and the given type.
`static MethodExpression`	`createVoidMethodExpression(String expression, Class<?>... parameterTypes)` Create a void method expression based on the given EL expression and the given parameter types, if any.
`static String`	`encodeHtml(UIComponent component)` Encodes the given component locally as HTML, with UTF-8 character encoding, independently from the current view.
`static <C extends UIComponent> Optional<C>`	`findClosestParent(UIComponent component, Class<C> parentType)` Finds from the given component the closest parent of the given parent type.
`static <C extends UIComponent> C`	`findComponent(String clientId)` Returns the UI component matching the given client ID search expression.
`static <C extends UIComponent> C`	`findComponentInChildren(UIComponent component, String clientId)` Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component, searching only in its children.
`static <C extends UIComponent> C`	`findComponentInParents(UIComponent component, String clientId)` Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component, searching only in its parents.
`static <C extends UIComponent> C`	`findComponentRelatively(UIComponent component, String clientId)` Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component.
`static <C extends UIComponent> List<C>`	`findComponentsInChildren(UIComponent component, Class<C> type)` Returns a list of UI components matching the given type in children of the given component.
`static <C extends UIComponent> List<C>`	`findComponentsInCurrentForm(Class<C> type)` Returns a list of UI components matching the given type in children of the currently submitted form.
`static Components.ForEach`	`forEachComponent()` Invokes an operation on every component in the component tree.
`static Components.ForEach`	`forEachComponent(FacesContext facesContext)` Invokes an operation on every component in the component tree.
`static List<String>`	`getActionExpressionsAndListeners(UIComponent component)` Returns a list of all action expressions and listeners associated with given component.
`static <T> T`	`getAttribute(UIComponent component, String name)` Returns the attribute of the given component on the given name.
`static <C extends UIComponent> C`	`getClosestParent(UIComponent component, Class<C> parentType)` Returns from the given component the closest parent of the given parent type, or `null` if none is found.
`static <C extends UIComponent> C`	`getCurrentActionSource()` Returns the source of the currently invoked action, or `null` if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation.
`static UICommand`	`getCurrentCommand()` Returns the currently invoked UI command component, or `null` if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation.
`static <C extends UIComponent> C`	`getCurrentComponent()` Returns the current UI component from the EL context.
`static UIForm`	`getCurrentForm()` Returns the currently submitted UI form component, or `null` if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation.
`static <T> Class<T>`	`getExpectedType(ValueExpression valueExpression)` Returns the expected type of the given value expression.
`static <T> Class<T>`	`getExpectedValueType(UIComponent component)` Returns the expected type of the "value" attribute of the given component.
`static <T> T`	`getImmediateValue(UIInput input)` Returns the value of the given input component whereby any unconverted submitted string value will immediately be converted/validated as this method is called.
`static String`	`getLabel(UIComponent component)` Returns the value of the `label` attribute associated with the given UI component if any, else the client ID.
`static UIMessage`	`getMessageComponent(UIInput input)` Returns the `UIMessage` component associated with given `UIInput` component.
`static UIMessages`	`getMessagesComponent()` Returns the first `UIMessages` component found in the current view.
`static String`	`getOptionalLabel(UIComponent component)` Returns the value of the `label` attribute associated with the given UI component if any, else null.
`static <T> List<ParamHolder<T>>`	`getParams(UIComponent component)` Returns an unmodifiable list with all child `UIParameter` components (`<f\|o:param>`) of the given parent component as a list of `ParamHolder` instances.
`static Map<String,List<String>>`	`getParams(UIComponent component, boolean includeRequestParams, boolean includeViewParams)` Returns an unmodifiable map with all request query string or view parameters, appended with all child `UIParameter` components (`<f\|o:param>`) of the given parent component.
`static <T> T`	`getValue(EditableValueHolder component)` Returns the value of the given editable value holder component without the need to know if the given component has already been converted/validated or not.
`static boolean`	`hasInvokedSubmit(UIComponent component)` Returns whether the given component has invoked the form submit.
`static boolean`	`hasSubmittedValue(EditableValueHolder component)` Returns whether the given editable value holder component has a submitted value.
`static UIComponent`	`includeCompositeComponent(UIComponent parent, String libraryName, String tagName, String id)` Create and include the composite component of the given library and resource name as child of the given UI component parent and return the created composite component.
`static UIComponent`	`includeCompositeComponent(UIComponent parent, String libraryName, String tagName, String id, Map<String,String> attributes)` Create and include the composite component of the given library and resource name as child of the given UI component parent, set the given attributes on it and return the created composite component.
`static void`	`includeFacelet(UIComponent parent, String path)` Include the Facelet file at the given (relative) path as child of the given UI component parent.
`static boolean`	`isEditable(UIInput input)` Returns whether the given UI input component is editable.
`static boolean`	`isRendered(UIComponent component)` Returns whether the given UI component and all of its parents is rendered.
`static void`	`resetForm(UIComponent component)` Reset all child `UIInput` components enclosed in the given `UIForm` component, or the closest `UIForm` parent of it.
`static void`	`resetInputs(UIComponent component)` Reset all child `UIInput` components enclosed in the given parent component.
`static void`	`setLabel(UIComponent component, Object label)` Sets the `label` attribute of the given UI component with the given value.
`static <C extends UIComponent> void`	`validateHasChild(UIComponent component, Class<C> childType)` Validate in development stage if the given component has at least a child of given child type.
`static <C extends UIComponent> void`	`validateHasDirectParent(UIComponent component, Class<C> parentType)` Validate in development stage if the given component has a direct parent of given parent type.
`static void`	`validateHasNoChildren(UIComponent component)` Validate in development stage if the given component has no children.
`static <C extends UIComponent> void`	`validateHasNoParent(UIComponent component, Class<C> parentType)` Validate in development stage if the given component has no parent of given parent type.
`static <C extends UIComponent> void`	`validateHasOnlyChildren(UIComponent component, Class<C> childType)` Validate in development stage if the given component has only children of given child type.
`static <C extends UIComponent> void`	`validateHasParent(UIComponent component, Class<C> parentType)` Validate in development stage if the given component has a parent of given parent type.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LABEL_ATTRIBUTE
```
public static final String LABEL_ATTRIBUTE
```
    The name of the label attribute.
    
    See Also:
    
    Constant Field Values
  - VALUE_ATTRIBUTE
```
public static final String VALUE_ATTRIBUTE
```
    The name of the value attribute.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getCurrentComponent
```
public static <C extends UIComponent> C getCurrentComponent()
```
    Returns the current UI component from the EL context.
    
    Type Parameters:
    
    C - The expected component type.
    
    Returns:
    
    The current UI component from the EL context.
    
    Throws:
    
    ClassCastException - When C is of wrong type.
    
    See Also:
    
    UIComponent.getCurrentComponent(FacesContext)
  - getAttribute
```
public static <T> T getAttribute(UIComponent component,
                                 String name)
```
    Returns the attribute of the given component on the given name.
    
    Type Parameters:
    
    T - The expected return type.
    
    Parameters:
    
    component - The component to return the attribute of the given name for.
    
    name - The name of the attribute of the given component to be returned.
    
    Returns:
    
    The attribute of the given component on the given name.
    
    Throws:
    
    ClassCastException - When T is of wrong type.
    
    Since:
    
    1.5
  - isRendered
```
public static boolean isRendered(UIComponent component)
```
    Returns whether the given UI component and all of its parents is rendered. This thus not only checks the component's own rendered attribute, but also of all of its parents.
    
    Parameters:
    
    component - The component to be checked.
    
    Returns:
    
    true if the given UI component and all of its parents is rendered.
    
    Since:
    
    1.8
  - findComponent
```
public static <C extends UIComponent> C findComponent(String clientId)
```
    Returns the UI component matching the given client ID search expression.
    
    Type Parameters:
    
    C - The expected component type.
    
    Parameters:
    
    clientId - The client ID search expression.
    
    Returns:
    
    The UI component matching the given client ID search expression.
    
    Throws:
    
    ClassCastException - When C is of wrong type.
    
    See Also:
    
    UIComponent.findComponent(String)
  - findComponentRelatively
```
public static <C extends UIComponent> C findComponentRelatively(UIComponent component,
                                                                String clientId)
```
    Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component. For this search both parents and children are consulted, increasingly moving further away from the given component. Parents are consulted first, then children.
    
    Type Parameters:
    
    C - The expected component type.
    
    Parameters:
    
    component - the component from which the relative search is started.
    
    clientId - The client ID search expression.
    
    Returns:
    
    The UI component matching the given client ID search expression.
    
    Throws:
    
    ClassCastException - When C is of wrong type.
    
    See Also:
    
    UIComponent.findComponent(String)
  - findComponentInParents
```
public static <C extends UIComponent> C findComponentInParents(UIComponent component,
                                                               String clientId)
```
    Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component, searching only in its parents.
    
    Type Parameters:
    
    C - The expected component type.
    
    Parameters:
    
    component - the component from which the relative search is started.
    
    clientId - The client ID search expression.
    
    Returns:
    
    The UI component matching the given client ID search expression.
    
    Throws:
    
    ClassCastException - When C is of wrong type.
    
    See Also:
    
    UIComponent.findComponent(String)
  - findComponentInChildren
```
public static <C extends UIComponent> C findComponentInChildren(UIComponent component,
                                                                String clientId)
```
    Returns the UI component matching the given client ID search expression relative to the point in the component tree of the given component, searching only in its children.
    
    Type Parameters:
    
    C - The expected component type.
    
    Parameters:
    
    component - the component from which the relative search is started.
    
    clientId - The client ID search expression.
    
    Returns:
    
    The UI component matching the given client ID search expression.
    
    Throws:
    
    ClassCastException - When C is of wrong type.
    
    See Also:
    
    UIComponent.findComponent(String)
  - findComponentsInChildren
```
public static <C extends UIComponent> List<C> findComponentsInChildren(UIComponent component,
                                                                       Class<C> type)
```
    Returns a list of UI components matching the given type in children of the given component.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to search in its children for UI components matching the given type.
    
    type - The type of the UI components to be searched in children of the given component.
    
    Returns:
    
    A list of UI components matching the given type in children of the given component.
  - findComponentsInCurrentForm
```
public static <C extends UIComponent> List<C> findComponentsInCurrentForm(Class<C> type)
```
    Returns a list of UI components matching the given type in children of the currently submitted form. The currently submitted form is obtained by getCurrentForm().
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    type - The type of the UI components to be searched in children of the currently submitted form.
    
    Returns:
    
    A list of UI components matching the given type in children of the currently submitted form.
    
    Since:
    
    3.1
  - getClosestParent
```
public static <C extends UIComponent> C getClosestParent(UIComponent component,
                                                         Class<C> parentType)
```
    Returns from the given component the closest parent of the given parent type, or null if none is found.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to return the closest parent of the given parent type for.
    
    parentType - The parent type.
    
    Returns:
    
    From the given component the closest parent of the given parent type, or null if none is found.
  - findClosestParent
```
public static <C extends UIComponent> Optional<C> findClosestParent(UIComponent component,
                                                                    Class<C> parentType)
```
    Finds from the given component the closest parent of the given parent type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to find the closest parent of the given parent type for.
    
    parentType - The parent type.
    
    Returns:
    
    From the given component the closest parent of the given parent type.
    
    Since:
    
    3.11
  - forEachComponent
```
public static Components.ForEach forEachComponent()
```
    Invokes an operation on every component in the component tree.
    This is a simplified version of regular component visiting that uses the builder pattern to provide the various optional parameters. Includes supports for only visiting components of a certain class type and two simplified functional interfaces / lambdas.
    See UIComponent.visitTree(VisitContext, VisitCallback)
    
    Returns:
    
    A new instance of Components.ForEach.
    
    Since:
    
    2.0
  - forEachComponent
```
public static Components.ForEach forEachComponent(FacesContext facesContext)
```
    Invokes an operation on every component in the component tree.
    This is a simplified version of regular component visiting that uses the builder pattern to provide the various optional parameters. Includes supports for only visiting components of a certain class type and two simplified functional interfaces / lambdas.
    See UIComponent.visitTree(VisitContext, VisitCallback)
    
    Parameters:
    
    facesContext - the faces context used for tree visiting
    
    Returns:
    
    A new instance of Components.ForEach, using the given faces context.
    
    Since:
    
    2.0
  - includeFacelet
```
public static void includeFacelet(UIComponent parent,
                                  String path)
                           throws IOException
```
    Include the Facelet file at the given (relative) path as child of the given UI component parent. This has the same effect as using <ui:include>. The path is relative to the current view ID and absolute to the webcontent root.
    
    Parameters:
    
    parent - The parent component to include the Facelet file in.
    
    path - The (relative) path to the Facelet file.
    
    Throws:
    
    IOException - Whenever given path cannot be read.
    
    Since:
    
    1.5
    
    See Also:
    
    FaceletContext.includeFacelet(UIComponent, String)
  - includeCompositeComponent
```
public static UIComponent includeCompositeComponent(UIComponent parent,
                                                    String libraryName,
                                                    String tagName,
                                                    String id)
```
    Create and include the composite component of the given library and resource name as child of the given UI component parent and return the created composite component. This has the same effect as using xmlns:my="http://xmlns.jcp.org/jsf/composite/libraryName and <my:tagName>. The given component ID must be unique relative to the current naming container parent and is mandatory for functioning of input components inside the composite, if any.
    
    Parameters:
    
    parent - The parent component to include the composite component in.
    
    libraryName - The library name of the composite component (path after "http://xmlns.jcp.org/jsf/composite/").
    
    tagName - The tag name of the composite component.
    
    id - The component ID of the composite component.
    
    Returns:
    
    The created composite component, which can if necessary be used to set more custom attributes on it.
    
    Since:
    
    1.5
  - includeCompositeComponent
```
public static UIComponent includeCompositeComponent(UIComponent parent,
                                                    String libraryName,
                                                    String tagName,
                                                    String id,
                                                    Map<String,String> attributes)
```
    Create and include the composite component of the given library and resource name as child of the given UI component parent, set the given attributes on it and return the created composite component. This has the same effect as using xmlns:my="http://xmlns.jcp.org/jsf/composite/libraryName and <my:tagName>. The given component ID must be unique relative to the current naming container parent and is mandatory for functioning of input components inside the composite, if any.
    The attribute values must represent literal values or literal EL expressions, exactly like as you would declare in the view file. E.g.
```
 attributes.put("foo", "#{bean.foo}");
 attributes.put("bar", "true");
 attributes.put("baz", "#{bean.baz(" + someId + ")}");
 
```
    Parameters:
    
    parent - The parent component to include the composite component in.
    
    libraryName - The library name of the composite component (path after "http://xmlns.jcp.org/jsf/composite/").
    
    tagName - The tag name of the composite component.
    
    id - The component ID of the composite component.
    
    attributes - The attributes to be set on the composite component.
    
    Returns:
    
    The created composite component, which can if necessary be used to set more custom attributes on it.
    
    Since:
    
    2.2
  - addScriptToBody
```
@Deprecated
public static UIComponent addScriptToBody(String script)
```
    Deprecated. since 3.6, use addScript(String) instead as this will automatically detect non-@all ajax postbacks.
    
    Add given JavaScript code as inline script to end of body of the current view. Note: this doesn't have any effect during non-@all ajax postbacks. Rather use Ajax.oncomplete(String...) instead.
    
    Parameters:
    
    script - JavaScript code to be added as inline script to end of body of the current view.
    
    Returns:
    
    The created script component.
    
    Since:
    
    2.2
  - addScriptResourceToBody
```
@Deprecated
public static UIComponent addScriptResourceToBody(String libraryName,
                                                              String resourceName)
```
    Deprecated. since 3.6, use addScriptResource(String, String) instead as this will automatically detect already-added resources, non-@all ajax postbacks and rendering state and pick the most optimal approach to add the JavaScript resource.
    
    Add given JavaScript resource to end of body of the current view. Note: this doesn't have any effect during non-@all ajax postbacks. Rather use Ajax.load(String, String) instead.
    
    Parameters:
    
    libraryName - Library name of the JavaScript resource.
    
    resourceName - Resource name of the JavaScript resource.
    
    Returns:
    
    The created script component resource.
    
    Since:
    
    2.2
  - addScriptResourceToHead
```
@Deprecated
public static UIComponent addScriptResourceToHead(String libraryName,
                                                              String resourceName)
```
    Deprecated. since 3.6, use addScriptResource(String, String) instead as this will automatically detect already-added resources, non-@all ajax postbacks and rendering state and pick the most optimal approach to add the JavaScript resource.
    
    Add given JavaScript resource to end of head of the current view. Note: this doesn't have any effect during non-@all ajax postbacks, nor during render response phase when the <h:head> has already been encoded. During non-@all ajax postbacks, rather use Ajax.load(String, String) instead, or during render response, rather use addScriptResourceToBody(String, String) instead.
    
    Parameters:
    
    libraryName - Library name of the JavaScript resource.
    
    resourceName - Resource name of the JavaScript resource.
    
    Returns:
    
    The created script component resource.
    
    Since:
    
    2.2
  - addScript
```
public static void addScript(String script)
```
    Add given JavaScript code to the current view which is to be executed as an inline script when the rendering is completed. When the current request is Faces.isAjaxRequestWithPartialRendering(), then it will delegate to Ajax.oncomplete(String...), else it will add given JavaScript code as inline script to end of body.
    
    Parameters:
    
    script - JavaScript code which is to be executed as an inline script.
    
    Since:
    
    3.6
  - addScriptResource
```
public static void addScriptResource(String libraryName,
                                     String resourceName)
```
    Add given JavaScript resource to the current view. This will first check if the resource isn't already rendered as per ResourceHandler.isResourceRendered(FacesContext, String, String). If not, then continue as below:
    - When the current request is a Faces.isAjaxRequestWithPartialRendering(), then it will delegate to Ajax.load(String, String).
    - Else when the <h:head> has not yet been rendered, then add given JavaScript resource to head.
    - Else add given JavaScript resource to end of the <h:body>.
    Parameters:
    
    libraryName - Library name of the JavaScript resource.
    
    resourceName - Resource name of the JavaScript resource.
    
    Since:
    
    3.6
  - buildView
```
public static UIViewRoot buildView(String viewId)
                            throws IOException
```
    Creates and builds a local view for the given view ID independently from the current view.
    
    Parameters:
    
    viewId - The ID of the view which needs to be created and built.
    
    Returns:
    
    A fully populated component tree of the given view ID.
    
    Throws:
    
    IOException - Whenever something fails at I/O level. This can happen when the given view ID is unavailable or malformed.
    
    Since:
    
    2.2
    
    See Also:
    
    ViewHandler.createView(FacesContext, String), ViewDeclarationLanguage.buildView(FacesContext, UIViewRoot)
  - encodeHtml
```
public static String encodeHtml(UIComponent component)
```
    Encodes the given component locally as HTML, with UTF-8 character encoding, independently from the current view. The current implementation, however, uses the current faces context. The same managed beans as in the current faces context will be available as well, including request scoped ones. But, depending on the nature of the provided component, the state of the faces context may be affected because the attributes of the context, request, view, session and application scope could be (in)directly manipulated during the encode. This may or may not have the desired effect. If the given view does not have any component resources, JSF forms, dynamically added components, component event listeners, then it should mostly be safe. In other words, use this at most for "simple templates" only, e.g. a HTML based mail template, which usually already doesn't have a HTML head nor body.
    
    Parameters:
    
    component - The component to capture HTML output for.
    
    Returns:
    
    The encoded HTML output of the given component.
    
    Throws:
    
    UncheckedIOException - Whenever something fails at I/O level. This would be quite unexpected as it happens locally.
    
    Since:
    
    2.2
    
    See Also:
    
    UIComponent.encodeAll(FacesContext)
  - getCurrentForm
```
public static UIForm getCurrentForm()
```
    Returns the currently submitted UI form component, or null if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation. If the latter is the case, you'd better invoke this method before navigation.
    
    Returns:
    
    The currently submitted UI form component.
    
    See Also:
    
    UIForm.isSubmitted()
  - getCurrentCommand
```
public static UICommand getCurrentCommand()
```
    Returns the currently invoked UI command component, or null if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation. If the latter is the case, you'd better invoke this method before navigation.
    
    Returns:
    
    The currently invoked UI command component.
    
    Since:
    
    1.6
  - getCurrentActionSource
```
public static <C extends UIComponent> C getCurrentActionSource()
```
    Returns the source of the currently invoked action, or null if there is none, which may happen when the current request is not a postback request at all, or when the view has been changed by for example a successful navigation. If the latter is the case, you'd better invoke this method before navigation.
    
    Type Parameters:
    
    C - The expected component type.
    
    Returns:
    
    The source of the currently invoked action.
    
    Since:
    
    2.4
  - isEditable
```
public static boolean isEditable(UIInput input)
```
    Returns whether the given UI input component is editable. That is when it is rendered, not disabled and not readonly.
    
    Parameters:
    
    input - The UI input component to be checked.
    
    Returns:
    
    true if the given UI input component is editable.
  - getLabel
```
public static String getLabel(UIComponent component)
```
    Returns the value of the label attribute associated with the given UI component if any, else the client ID. It never returns null.
    
    Parameters:
    
    component - The UI component for which the label is to be retrieved.
    
    Returns:
    
    The value of the label attribute associated with the given UI component if any, else the client ID.
  - getOptionalLabel
```
public static String getOptionalLabel(UIComponent component)
```
    Returns the value of the label attribute associated with the given UI component if any, else null.
    
    Parameters:
    
    component - The UI component for which the label is to be retrieved.
    
    Returns:
    
    The value of the label attribute associated with the given UI component if any, else null.
  - setLabel
```
public static void setLabel(UIComponent component,
                            Object label)
```
    Sets the label attribute of the given UI component with the given value.
    
    Parameters:
    
    component - The UI component for which the label is to be set.
    
    label - The label to be set on the given UI component.
  - getValue
```
public static <T> T getValue(EditableValueHolder component)
```
    Returns the value of the given editable value holder component without the need to know if the given component has already been converted/validated or not. Note that it thus returns the unconverted submitted string value when the conversion/validation hasn't been taken place for the given component and it returns the converted object value -if applicable- when conversion/validation has been taken place for the given component.
    
    Type Parameters:
    
    T - The expected return type.
    
    Parameters:
    
    component - The editable value holder component to obtain the value for.
    
    Returns:
    
    The value of the given editable value holder component.
    
    Throws:
    
    ClassCastException - When T is of wrong type.
  - getImmediateValue
```
public static <T> T getImmediateValue(UIInput input)
```
    Returns the value of the given input component whereby any unconverted submitted string value will immediately be converted/validated as this method is called. This method thus always returns the converted/validated value.
    
    Type Parameters:
    
    T - The expected return type.
    
    Parameters:
    
    input - The input component to obtain the converted/validated value for.
    
    Returns:
    
    The converted/validated value of the given input component.
    
    Throws:
    
    ClassCastException - When T is of wrong type.
    
    Since:
    
    1.2
  - hasSubmittedValue
```
public static boolean hasSubmittedValue(EditableValueHolder component)
```
    Returns whether the given editable value holder component has a submitted value.
    
    Parameters:
    
    component - The editable value holder component to be checked.
    
    Returns:
    
    true if the given editable value holder component has a submitted value, otherwise false.
  - getExpectedValueType
```
public static <T> Class<T> getExpectedValueType(UIComponent component)
```
    Returns the expected type of the "value" attribute of the given component. This is useful in among others a "generic entity converter".
    
    Type Parameters:
    
    T - The expected type of the expected type of the "value" attribute of the given component.
    
    Parameters:
    
    component - The component to obtain the expected type of the "value" attribute for.
    
    Returns:
    
    The expected type of the "value" attribute of the given component, or null when there is no such value.
    
    Throws:
    
    ClassCastException - When T is of wrong type.
    
    Since:
    
    3.8
  - getExpectedType
```
public static <T> Class<T> getExpectedType(ValueExpression valueExpression)
```
    Returns the expected type of the given value expression. This first inspects if the ValueExpression.getExpectedType() returns a specific type, i.e. not java.lang.Object, and then returns it, else it inspects the actual type of the property behind the expression string.
    
    Type Parameters:
    
    T - The expected type of the expected type of the given value expression.
    
    Parameters:
    
    valueExpression - The value expression to obtain the expected type for.
    
    Returns:
    
    The expected type of the given value expression.
    
    Throws:
    
    ClassCastException - When T is of wrong type.
    
    Since:
    
    3.8
  - hasInvokedSubmit
```
public static boolean hasInvokedSubmit(UIComponent component)
```
    Returns whether the given component has invoked the form submit. In non-ajax requests, that can only be an UICommand component. In ajax requests, that can also be among others an UIInput component.
    
    Parameters:
    
    component - The component to be checked.
    
    Returns:
    
    true if the given component has invoked the form submit.
    
    Since:
    
    1.3
  - getParams
```
public static <T> List<ParamHolder<T>> getParams(UIComponent component)
```
    Returns an unmodifiable list with all child UIParameter components (<f|o:param>) of the given parent component as a list of ParamHolder instances. Those with disabled=true and an empty name are skipped.
    
    Type Parameters:
    
    T - The type of the param value.
    
    Parameters:
    
    component - The parent component to retrieve all child UIParameter components from.
    
    Returns:
    
    An unmodifiable list with all child UIParameter components having a non-empty name and not disabled.
    
    Since:
    
    2.1
  - getParams
```
public static Map<String,List<String>> getParams(UIComponent component,
                                                 boolean includeRequestParams,
                                                 boolean includeViewParams)
```
    Returns an unmodifiable map with all request query string or view parameters, appended with all child UIParameter components (<f|o:param>) of the given parent component. Those with disabled=true or an empty name or an empty value are skipped. The <f|o:param> will override any included view or request parameters on the same name.
    
    Parameters:
    
    component - The parent component to retrieve all child UIParameter components from.
    
    includeRequestParams - Whether or not to include request query string parameters. When set to true, then this overrides the includeViewParams.
    
    includeViewParams - Whether or not to include view parameters.
    
    Returns:
    
    An unmodifiable list with all request query string or view parameters, appended with all child UIParameter components having a non-empty name and not disabled.
    
    Since:
    
    2.4
  - getMessageComponent
```
public static UIMessage getMessageComponent(UIInput input)
```
    Returns the UIMessage component associated with given UIInput component. This returns null if none can be found.
    
    Parameters:
    
    input - The UI input component to find the associated message component for.
    
    Returns:
    
    The UIMessage component associated with given UIInput component.
    
    Since:
    
    2.5
  - getMessagesComponent
```
public static UIMessages getMessagesComponent()
```
    Returns the first UIMessages component found in the current view. This returns null if none can be found.
    
    Returns:
    
    The first UIMessages component found in the current view.
    
    Since:
    
    2.5
  - resetForm
```
public static void resetForm(UIComponent component)
```
    Reset all child UIInput components enclosed in the given UIForm component, or the closest UIForm parent of it.
    
    Parameters:
    
    component - The component representing the UIForm itself, or to find the closest UIForm parent for.
    
    Throws:
    
    IllegalArgumentException - When given component is not an UIForm, or does not have a UIForm parent.
    
    Since:
    
    2.5
  - resetInputs
```
public static void resetInputs(UIComponent component)
```
    Reset all child UIInput components enclosed in the given parent component.
    
    Parameters:
    
    component - The parent component to reset all child UIInput components in.
    
    Since:
    
    2.5
  - addFormIfNecessary
```
public static void addFormIfNecessary()
```
    Add an UIForm to the current view if absent. This might be needed for scripts which rely on JSF view state identifier and/or on functioning of jsf.ajax.request().
    
    Since:
    
    3.6
  - createValueExpression
```
public static ValueExpression createValueExpression(String expression,
                                                    Class<?> type)
```
    Create an editable value expression based on the given EL expression and the given type.
    
    Parameters:
    
    expression - The EL expression to represent an editable value expression.
    
    type - The type of the property referenced by the value expression.
    
    Returns:
    
    The created editable value expression, ready to be used as UIComponent.setValueExpression(String, ValueExpression).
  - createMethodExpression
```
public static MethodExpression createMethodExpression(String expression,
                                                      Class<?> returnType,
                                                      Class<?>... parameterTypes)
```
    Create a method expression based on the given EL expression, the given return type and the given parameter types, if any. As an example, the following action method examples,
    - public void submit1()
    - public String submit2()
    - public void submit3(String argument)
    - public String submit4(String argument)
    - public void submit5(String argument1, Long argument2)
    - public String submit6(Long argument1, String argument2)
    can be created as follows:
    - createMethodExpression("#{bean.submit1}", Void.class);
    - createMethodExpression("#{bean.submit2}", String.class);
    - createMethodExpression("#{bean.submit3('foo')}", Void.class, String.class);
    - createMethodExpression("#{bean.submit4('foo')}", String.class, String.class);
    - createMethodExpression("#{bean.submit5('foo', 0)}", Void.class, String.class, Long.class);
    - createMethodExpression("#{bean.submit6(0, 'foo')}", String.class, Long.class, String.class);
    Parameters:
    
    expression - The EL expression to create a method expression for.
    
    returnType - The return type of the method expression. Can be null if you don't care about the return type (e.g. void or String).
    
    parameterTypes - The parameter types of the method expression.
    
    Returns:
    
    The created method expression, ready to be used as UICommand.setActionExpression(MethodExpression).
  - createVoidMethodExpression
```
public static MethodExpression createVoidMethodExpression(String expression,
                                                          Class<?>... parameterTypes)
```
    Create a void method expression based on the given EL expression and the given parameter types, if any. As an example, the following action method examples,
    - public void submit1()
    - public void submit3(String argument)
    - public void submit5(String argument1, Long argument2)
    can be created as follows:
    - createVoidMethodExpression("#{bean.submit1}");
    - createVoidMethodExpression("#{bean.submit3('foo')}", String.class);
    - createVoidMethodExpression("#{bean.submit5('foo', 0)}", String.class, Long.class);
    Parameters:
    
    expression - The EL expression to create a void method expression for.
    
    parameterTypes - The parameter types of the void method expression.
    
    Returns:
    
    The created void method expression, ready to be used as UICommand.setActionExpression(MethodExpression).
  - createActionListenerMethodExpression
```
public static MethodExpressionActionListener createActionListenerMethodExpression(String expression)
```
    Create an action listener method expression based on the given EL expression. The target method must take an ActionEvent as argument. As an example, the following action method example,
    - public void actionListener(ActionEvent event)
    can be created as follows:
    - createActionListenerMethodExpression("#{bean.actionListener}");
    Parameters:
    
    expression - The EL expression to create an action listener method expression for.
    
    Returns:
    
    The created action listener method expression, ready to be used as UICommand.addActionListener(javax.faces.event.ActionListener).
  - createAjaxBehavior
```
public static AjaxBehavior createAjaxBehavior(String expression)
```
    Create an ajax behavior which should invoke an ajax listener method expression based on the given EL expression. The target method must take an AjaxBehaviorEvent as argument. As an example, the following ajax listener example,
    - public void ajaxListener(AjaxBehaviorEvent event)
    can be created as follows:
    - createAjaxBehavior("#{bean.ajaxListener}");
    Note that this is essentially the programmatic equivalent of <f:ajax>. So if you intented to create for example a <p:ajax> programmatically, then don't use this method.
    Parameters:
    
    expression - The EL expression to be invoked when the created ajax behavior is processed.
    
    Returns:
    
    The created ajax behavior, ready to be used as UIComponentBase.addClientBehavior(String, ClientBehavior) whereby the string argument represents the client event name, such as "action", "valueChange", "click", "blur", etc.
  - getActionExpressionsAndListeners
```
public static List<String> getActionExpressionsAndListeners(UIComponent component)
```
    Returns a list of all action expressions and listeners associated with given component. This covers expressions in action attribute of command components and listener attribute of ajax components. Any method expressions are in format #{bean.method} and any action listeners are added as fully qualified class names. This list is primarily useful for logging postback actions in a phase listener. You can use getCurrentActionSource() to obtain the current action source.
    
    Parameters:
    
    component - The component to retrieve all action expressions and listeners from.
    
    Returns:
    
    A list of all action expressions and listeners associated with given component.
    
    Since:
    
    2.4
  - validateHasParent
```
public static <C extends UIComponent> void validateHasParent(UIComponent component,
                                                             Class<C> parentType)
```
    Validate in development stage if the given component has a parent of given parent type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to be validated.
    
    parentType - The parent type to be checked.
    
    Throws:
    
    IllegalStateException - When the given component doesn't have any parent of the given type.
  - validateHasDirectParent
```
public static <C extends UIComponent> void validateHasDirectParent(UIComponent component,
                                                                   Class<C> parentType)
```
    Validate in development stage if the given component has a direct parent of given parent type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to be validated.
    
    parentType - The parent type to be checked.
    
    Throws:
    
    IllegalStateException - When the given component doesn't have a direct parent of the given type.
  - validateHasNoParent
```
public static <C extends UIComponent> void validateHasNoParent(UIComponent component,
                                                               Class<C> parentType)
```
    Validate in development stage if the given component has no parent of given parent type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to be validated.
    
    parentType - The parent type to be checked.
    
    Throws:
    
    IllegalStateException - When the given component does have a parent of the given type.
    
    Since:
    
    2.5
  - validateHasChild
```
public static <C extends UIComponent> void validateHasChild(UIComponent component,
                                                            Class<C> childType)
```
    Validate in development stage if the given component has at least a child of given child type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to be validated.
    
    childType - The child type to be checked.
    
    Throws:
    
    IllegalStateException - When the given component doesn't have any children of the given type.
    
    Since:
    
    2.5
  - validateHasOnlyChildren
```
public static <C extends UIComponent> void validateHasOnlyChildren(UIComponent component,
                                                                   Class<C> childType)
```
    Validate in development stage if the given component has only children of given child type.
    
    Type Parameters:
    
    C - The generic component type.
    
    Parameters:
    
    component - The component to be validated.
    
    childType - The child type to be checked.
    
    Throws:
    
    IllegalStateException - When the given component has children of a different type.
    
    Since:
    
    2.5
  - validateHasNoChildren
```
public static void validateHasNoChildren(UIComponent component)
```
    Validate in development stage if the given component has no children.
    
    Parameters:
    
    component - The component to be validated.
    
    Throws:
    
    IllegalStateException - When the given component has any children.

Class Components

Usage

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LABEL_ATTRIBUTE

VALUE_ATTRIBUTE

Method Detail

getCurrentComponent

getAttribute

isRendered

findComponent

findComponentRelatively

findComponentInParents

findComponentInChildren

findComponentsInChildren

findComponentsInCurrentForm

getClosestParent

findClosestParent

forEachComponent

forEachComponent

includeFacelet

includeCompositeComponent

includeCompositeComponent

addScriptToBody

addScriptResourceToBody

addScriptResourceToHead

addScript

addScriptResource

buildView

encodeHtml

getCurrentForm

getCurrentCommand

getCurrentActionSource

isEditable

getLabel

getOptionalLabel

setLabel

getValue

getImmediateValue

hasSubmittedValue

getExpectedValueType

getExpectedType

hasInvokedSubmit

getParams

getParams

getMessageComponent

getMessagesComponent

resetForm

resetInputs

addFormIfNecessary

createValueExpression

createMethodExpression

createVoidMethodExpression

createActionListenerMethodExpression

createAjaxBehavior

getActionExpressionsAndListeners

validateHasParent

validateHasDirectParent

validateHasNoParent

validateHasChild

validateHasOnlyChildren

validateHasNoChildren